In other words, an infalling object causes the horizon of a black hole to expand, which only occurs after the object has fallen into the hole, allowing an observable horizon in finite time. Our results are novel although consistent with many other investigations of models of nonsingular black holes. The radiating counterpart renders a nonsingular . In 2007, Shuan Nan Zhang of Tsinghua University proposed a model in which the event horizon of a potential black hole only forms (or expands) after an object falls into the existing horizon, or after the horizon has exceeded the critical density. [2] Correspondence between phases of black membranes wrapped on a two-torus of side L (left) and quickly-rotating MP black holes with rotation parameter a L r 0 (right: must be rotated along a vertical axis): (i) uniform black membrane and MP black hole; (ii) nonuniform black membrane and pinched black hole; (iii) pinched-off membrane and . The metric is not derived from any particular alternative theory of gravity, but provides a framework to test the formation and evaporation of non-singular black holes both . This page was last edited on 24 October 2022, at 03:16. ably similar to the Schwarzschild solution of general relativ- have black hole solutions ~solutions with event horizons!. Preceding unsigned comment added by 212.201.74.10 (talk) 17:30, 4 November 2007 (UTC), Please see the new comments about alternative black hole models in the main talk. This proposal is fundamentally wrong. Spherically symmetric space-times provide many examples for interesting black hole solutions . Try Combster now! For example, several alternative black hole models were shown to be unstable in extremely fast rotation,[6] which, by conservation of angular momentum, would be a not unusual physical scenario for a collapsed star (see pulsar). In higher dimensions this is no longer true : varieties can have many different nonsingular projective models. The top 4 are: black holes, black hole information paradox, gravastar and event horizon.You can get the definition(s) of a word in the list below by tapping the question-mark icon next to it. This was absolute necessary because these alternative models are not worth to be regarded as serios alternatives and a reader with no deeper physical backround would not be able to notice that. Download Download PDF. A number of works in the direction of nonsingular models were criticized and rejected. Evolving Black Hole Horizons in General Relativity and Alternative Gravity. A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon. Cardoso, Vitor; Paolo Pani; Mariano Cadoni; Marco Cavaglia (2008). As we shall see, the maximal curva- By Valerio Faraoni. A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon. Later the same authors reinterpreted the first non-singular black hole geometry, the Bardeen toy Model,[9] as a nonlinear-electrodynamics-based regular black hole. This segment consists of strictly diagonally dominant ( thus nonsingular) matrices, except maybe for A. https://en.wikipedia.org/w/index.php?title=Talk:Nonsingular_black_hole_models&oldid=410159268, This page was last edited on 26 January 2011, at 12:51. Download Citation | On Jul 18, 2022, M. Cadoni and others published Effective models of nonsingular quantum black holes | Find, read and cite all the research you need on ResearchGate 1972 Jacob Bekenstein suggests that black holes have an entropy proportional to their surface area due to information loss effects. Model for nonsingular black hole collapse and evaporation. They come up with crazy ideas which has nothing to do with real science. The two-dimensional theory is also used to model the evaporation process of the near-extremal four-dimensional black hole. Over the lifetime, 1567 publication(s) have been published within this topic receiving 56246 citation(s). [11], Avoiding paradoxes in the standard black hole model. [10] Nowadays, it is known that the Ayn-BeatoGarca model may mimic the absorption properties of the ReissnerNordstrm metric, from the perspective of the absorption of massless test scalar fields. Grav. George Chapline (1998), "The Black Hole Information Puzzle and Evidence for a Cosmological Constant". In other words, an infalling object causes the horizon of a black hole to expand, which only occurs after the object has fallen into the hole, allowing an observable horizon in finite time. The Hayward metric is the simplest description of a black hole which is non-singular.The metric was written down by Sean Hayward as the minimal model which is regular, static, spherically symmetric and asymptotically flat. For a black hole to physically exist as a solution to Einstein's equation, it must form an event horizon in finite time relative to outside observers. Such research has attracted much media attention,[5] as black holes have long captured the imagination of both scientists and the public for both their innate simplicity and mysteriousness. The basic model of a black hole can be summed up as follows: gravity wins. Abhas Mitra (2005), "Comments on the proposal of Dark Energy Stars by Chapline", https://ru.wikipedia.org/w/index.php?title=Non-singular_ black hole models&oldid, Witnessing matter falling into a black hole by a distant observer, Black holes don't exist, Case physicists report. A NonSingular Black Hole Authors: Aleksandar Bogojevic Dejan Stojkovic University at Buffalo, The State University of New York Abstract and Figures We present a completely integrable deformation. "Ergoregion instability rules out black hole doubles". In particular, in 2007, Shuan Nan Zhang from Tsinghua University proposed a model in which the event horizon of a potential black hole is formed (or expanded) only after the falling object reaches the existing horizon, or after the horizon exceeds the critical density . Signal/ Indicator Suites. Such models were originally proposed by theoretical physicist Raj Pathria, [1] and concurrently by mathematician I. J. As a consequence the quantum back reaction is negligible. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. Starting with a nonrotating LQG black hole as a seed metric, we construct a rotating spacetime using the revised Newman-Janis algorithm. Ayn-Beato, Eloy; Garca, Alberto (9 November 2000). There is nothing to talk about. We also obtain a metric for a charged nonsingular black hole obeying similar restrictions as the neutral one and construct higher dimensional models of neutral and charged black holes. The metric was written down by Sean Hayward as the minimal model that is regular, static, spherically symmetric and asymptotically flat. Because of the magnetic charge, the thermodynamic quantities are corrected, and the Hawking--Page phase . A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon. by imposing the null energy condition on the 3-brane for a bulk having non . 24 235-242. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. I could work out a model in which a collapsing star becomes a blue elephant. [citation needed]Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. This space-like defect is located inside o A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon.. Non-singular black hole models are mathematical theories describing black holes without the occurrence of paradoxes that arise in the standard black hole model, including the paradoxes of the disappearance of information and the unobservability of the black hole event horizon . For example do you know that the gravastar picture does only work when there is a phase transition of the vacuum-state? Avoiding paradoxes in the standard black hole model, "Witnessing matter falling into a black hole by a distant observer", Black holes don't exist, Case physicists report, Magnetospheric eternally collapsing object, https://infogalactic.com/w/index.php?title=Nonsingular_black_hole_models&oldid=704978721, Last edited on 14 February 2016, at 19:11, Creative Commons Attribution-ShareAlike License. Paula, Marco; Leite, Luiz; Crispino, Lus (12 November 2020). nonsingular black hole is analogus to Russian nesting dolls. Good. At present, several models have been developed to describe the collapse of stars with a mass significantly exceeding the Chandrasekhar limit, including a gravastar and a dark energy star.. Such research has attracted much media attention,[5] as black holes have long captured the imagination of both scientists and the public for both their innate simplicity and mysteriousness. Namely, after falling into the black hole of radius $r_{g}$, an observer, instead of being destroyed at the singularity, gets for a short time into the region with limiting curvature. About; gmrs ghost antenna guard dawg keyless ignition for indian scout a body is projected from the ground with a speed u ASJC Scopus subject areas Nuclear and High Energy Physics Motivated by the analogy with the cosmological Schwarzschild-de Sitter solution, we construct a broad class of nonsingular, static, asymptotically flat black-hole solutions with a de Sitter (dS) core, sourced by an . The recent theoretical results have therefore undergone much scrutiny and most of them are now ruled out by theoretical studies. While black holes were a well-established part of mainstream physics for most of the end of the 20th century, alternative models received new attention when models proposed by George Chapline and later by Lawrence Krauss, Dejan Stojkovic, and Tanmay Vachaspati of Case Western Reserve University showed in several separate models that black hole horizons could not form.[3][4]. 1972 James Bardeen, Brandon Carter, and Stephen Hawking propose four laws of black hole mechanics in analogy with the laws of thermodynamics. A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon. Hours of Admissions. Abstract In this paper we present a nonsingular black hole model as a possible end-product of gravitational collapse. After testing the validity of the approximate signal-to-noise ratio (SNR) calculation for different space based interferometers, we discuss the SNR of . This is due to the fact that the scientist confound the fact that an asymptotic observer will never see a signal from the event horizon due to the space-time curvature with the misbeliev that it takes an infinite amount of time for horizon formation. . Property Value; dbo:abstract: Below is a list of nonsingular black hole models words - that is, words related to nonsingular black hole models. The root cause of all black holesbe they tiny primordial black holes, solar mass black holes, or supermassive galactic black holesis gravity. 1992 Vacuum nonsingular black hole Gen. Rel. [citation needed] Today some of the most viable candidates for the result of the collapse of a star with mass well above the Chandrasekhar limit include the gravastar and the dark energy star. The solution proposed by Shuan Zhang does not resolve the paradox of information disappearance. [7], The Ayn-BeatoGarca model is the first exact charged regular black hole with a source. RSI Strategy Suite for MultiCharts - The RSI Strategy Suite for MultiCharts offers a primary RSI -based PowerLanguage formula , along with accessory formulas , that together implement a collection of analysis, visualization, presentation, and optimization techniques to create a complete solution for 4-line indicator. After that he re-emerges in the near horizon region of a SamuelRiv 19:17, 3 November 2007 (UTC). Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. [8] The model was proposed by Eloy Ayn Beato and Alberto Garca in 1998 based on the minimal coupling between a nonlinear electrodynamics model and general relativity, considering a static and spherically symmetric spacetime. Alternative models of black holes attracted attention when , and later Lawrence Krauss , Dejan Stojkovic and Tenmey Vachaspati from the Case Western University reserve showed that in some models the black hole event horizon cannot form [3] [4] .
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